Solidwork stop responding

My system is Dell Precision T5400 with 4GB RAM. I am usingSolidworks Professional 2008 with service pack 5.0.

Solidworks application stops at any moment of time. Otherapplication is working fine at that time.

My IT administrator format my system twice but still the problempersist.

Please help me to solve this problem.

SolidworksEdrawings